<template>
  <view>
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧滚动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="left-scroll-view">
        <view class="left-scroll-view-item" v-for="(item,index) in cateList" :key="item.cat_id"
          :class="{active:currentIndex===index}" @click="handleCate(item,index)">{{item.cat_name}}</view>
      </scroll-view>
      <!-- 右侧滚动区域 -->
      <scroll-view scroll-y="true" :style="{height:wh+'px'}" class="right-scroll-view" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item, index) in cateLevel2" :key="index">
          <view class="cate-lv2-title">/ {{item.cat_name}} /</view>
          <!-- 三级分类 Item 项 -->
          <view class="cate-lv3-list">
            <view class="cate-lv3-item" v-for="(item3, index3) in item.children" :key="index3" @click="goGoodList(item3)">
              <!-- 图片 -->
              <image :src="item3.cat_icon"></image>
              <!-- 文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import {
    getError
  } from "@/utils/getError.js"
  export default {
    data() {
      return {
        wh: 0,
        cateList: [],
        currentIndex: 0,
        cateLevel2: [],
        scrollTop:0
      };
    },
    onLoad() {
      // 获取当前手机的信息
      const sysInfo = uni.getSystemInfoSync()
      // 获取到当前窗口可用高度
      this.wh = sysInfo.windowHeight-50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {
          data
        } = await uni.$http.get('/api/public/v1/categories')
        getError(data.meta.status)
        this.cateList = data.message
        this.cateLevel2 = data.message[0].children
      },
      handleCate(item, index) {
        this.currentIndex = index
        this.cateLevel2 = item.children
        this.scrollTop=this.scrollTop===0?1:0
      },
      goGoodList(item){
        uni.navigateTo({
          url:"/pagesA/goods_list/goods_list?cid="+item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:"/pagesA/search/search"
        })
      }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;

        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;

          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
    .right-scroll-view {
      background-color: #ffffff;
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
  
    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
  
      image {
        width: 60px;
        height: 60px;
      }
  
      text {
        font-size: 12px;
      }
    }
  }
</style>
